

    {{--<iframe src="/student/yzm"' frameborder=0 ></iframe>--}}
    <form method="POST" action="" >
        {{ csrf_field() }}
        <input type="hidden" name="act" value="login">
        <input type="text" name="code" />
        <input type="submit" name="submit" >
        <img src="/student/yzm"   style='width: 100px; height:40px'  alt="">
    </form>